Tacoma Climate Zone & Energy Code

Climate Zone: IECC Climate Zone 4C (marine). Tacoma shares Seattle's mild marine climate: 21°F heating design and 84°F/65°F cooling design. JBLM military presence drives consistent, stable residential construction demand.

Energy Code & Manual J Requirement: Washington State Energy Code (WSEC). ACCA Manual J required for all Pierce County HVAC permit applications.

Local Electric Utility: Tacoma Public Utilities (TPU, City-owned)

Building Department: City of Tacoma Planning & Development Services

Local Trade Association: ACCA Northwest Chapter / ASHRAE Pacific Northwest Chapter